JPH0821292B2 - Electric spring operation mechanism for circuit breaker - Google Patents

Description

Description: [Object of the Invention] (Field of Industrial Application) The present invention relates to an electric spring operating mechanism of a circuit breaker.

(Prior Art) In recent years, the tendency of the increase in power demand and the concentration of power consumption in cities has been increasing year by year. In addition, the supply of electric power that meets such demands is required to be highly reliable and economical, and the transmission system is becoming more complicated and larger in capacity. On the other hand, because of the narrowing of substations due to the shortage of substation sites in cities, it is required to reduce the size of substations, and closed gas switchyards that insulate disconnectors, busbars, etc., with SF ₆ gas, etc. are becoming popular. In closed gas switchyards, the reliability of the circuit breaker, which is an important device in the switchgear, is required, while miniaturization is required because the circuit breakers account for a large proportion of the closed gas switchyard. .

By the way, as the operating force of the above circuit breaker, pneumatic pressure has been mainly used in the past, but miniaturization of equipment is desired, and due to noise problems in urban areas, hydraulic pressure and electric springs are used. It's coming. In particular, since the electric spring operation mechanism does not use fluid pressure, auxiliary equipment such as a compressor and a pump are not necessary, and a seal portion is not necessary, and the electric spring operation mechanism is composed of only so-called mechanical parts. Relatively simple and reliable. For this reason, in the gas circuit breakers, the operating force of the medium voltage class circuit breakers of 60 KV to 120 KV has been very frequently used in recent years.

FIG. 3 shows a bird's-eye view development view of an electric spring operating mechanism which has been conventionally used. The operation process of this electric spring operating mechanism will be described below.

Closing spring energy The driving force of the electric motor 1 is decelerated via the V belts 2 and 3 and the V pulleys 4 and 5, and the sprocket 6 and the chain 7,
8 、 Sprocket 9、10、11 and then slower. The driving force of the electric motor 1 that has been decelerated in this way is the sprocket 11
It is transmitted to the shaft 13 via the clutch claw 12 arranged above,
In addition, sprocket 14, chain 15, sprocket 16
Is transmitted to the cam shaft 17 via the to rotate the cam shaft 17.
Then, due to this rotational force, the eccentric cam 18 fixed to the cam shaft 17 pushes up one end of the lever 20 rotating about the shaft 19 upward. At this time, the closing spring 21 arranged below the other end of the lever 20 is compressed, and the closing spring is charged. It should be noted that a one-way clutch is attached on the way so that the respective constituent members do not reverse due to the spring force even if the electric motor stops halfway.

Further, when the closing spring 21 is charged as described above, as shown in FIG. 4, the clutch cam 22 fixed on the sprocket 16 disengages the clutch lever 24 rotating about the shaft 23. Press in the right direction in the figure. As a result, the clutch claw 12 arranged on the sprocket 11 is pressed to the left side in the figure, and is rotated about the pin 25, disengaged from the shaft 13, and the driving force of the electric motor 1 is reduced to the shaft 13. And the closing spring 21 is no longer charged.

Closing the circuit breaker and accumulating the breaking spring When a closing command is issued to the breaker, the closing spring 21 pushes up the lever 20 to rotate about the shaft 19 and rotate the eccentric cam 18, which causes eccentricity. The closing cam 26 fixed to the cam 18 and the cam shaft 17 rotates, and further, the rotation causes the lever 27 to rotate about the shaft 28 and the coaxial output lever 29 to rotate, and is connected to the tip thereof. The drive shaft 33 of the circuit breaker is moved to close the circuit breaker.

On the other hand, sandwiching the shaft 28, on the side opposite to the closing cam 26,
The rod 30 connected to the lever 27 moves together with the closing operation of the circuit breaker, rotates the lever 31, and stores the breaking spring 32.

In this process, the clutch cam 22 and the clutch lever 24 are not disengaged, so that the clutch pawl 12 is not engaged with the shaft 13. Therefore, the rotation of the shaft 17 is not transmitted to the electric motor and the electric motor 1 is not damaged by the rapid rotation of the shaft 17.

Re-accumulation of the closing spring At the time when the accumulation of the breaking spring 32 is completed, the clutch cam 22 and the clutch lever 24 can be disengaged, so that the clutch lever 24 pivots to the left side in FIG. 4, resulting in the sprocket. The clutch pawl 12 disposed on the shaft 11 is rotated rightward in the figure by the clutch pawl return spring 34, and is engaged with the shaft 13 again. By this, the same process as described in
The closing spring 21 is stored again.

Breaking of circuit breaker When a breaking command is issued to the circuit breaker, the lever 31 is rotated by the breaking spring 32 and the lever 27 is rotated through the rod 30. The drive shaft 33 of the circuit breaker provided is moved to break the circuit breaker.

However, as described above, in the conventional electric spring operating mechanism for circuit breaker, the power of the closing spring is stored by significantly reducing the driving force of the electric motor. A V-belt, a chain, etc. are used as the speed reducing mechanism. However, since the reduction ratio of the V-belt and the chain is limited to about 5 to 6, as shown in FIG. It required a very multi-stage speed reduction mechanism, with a total of five stages, three stages with a chain.

Therefore, the number of accessories such as shafts, sprockets, V-pulleys, etc. is very large, and the assembly process becomes very complicated.
It was also not desirable from an economic perspective.

Also, since there are many places where V-belts and chains are installed,
It was very likely that they would be damaged, and reliability was reduced.

In addition, the clutch claws 12 arranged on the sprocket 11
However, it plays an important role in power transmission, requires reliable operation, and is required to transmit a large torque.

However, the clutch pawl 12 must be disposed on the sprocket 11, and due to its mounting position and mounting structure,
It cannot be made too big. If the clutch pawl 12 is damaged or becomes inoperable, the driving force of the electric motor 1 is not transmitted to the shaft 17 and the closing spring 21 cannot be charged. In addition, by releasing the closing spring 21,
It is conceivable that when 17 rotates rapidly, the rotation is further amplified and the electric motor 1 is rotated and damaged.

(Problems to be Solved by the Invention) As described above, in the conventional electric spring operating mechanism for circuit breaker, the number of parts constituting the speed reducing mechanism of the electric motor is very large, the assembly process is very complicated, and the cost is also low. It was getting higher. Further, the constituent members are easily damaged, and the reliability of closing and closing operations of the circuit breaker is impaired.

Therefore, the present invention has been proposed in order to eliminate the above drawbacks, and an object thereof is to provide an economical and highly reliable electric spring operating mechanism for a circuit breaker, which enables a reduction in the number of parts of a reduction mechanism. To do.

[Structure of the Invention] (Means for Solving the Problems) In the electric spring operating mechanism for circuit breaker of the present invention, a reduction mechanism using a worm gear is connected to the electric motor, and the outer ring of the one-way clutch is arranged on the worm wheel of the worm gear. Then
Further, the inner ring of the one-way clutch is arranged on the outer ring, and the closing spring can be stored by the driving force of the electric motor transmitted to the inner ring.

(Operation) According to the electric spring operating mechanism for a circuit breaker of the present invention, since the worm gear is used as the reduction mechanism, the number of parts can be significantly reduced, and the clutch pawl which is easily damaged is unnecessary. Therefore, the reliability of the circuit breaker electric spring operating mechanism can be greatly improved.

(Embodiment) An embodiment of the present invention will be specifically described below with reference to FIGS. 1 and 2. The same members as those of the conventional type shown in FIGS. 3 and 4 are designated by the same reference numerals and the description thereof will be omitted.

* Structure of Embodiment * In this embodiment, as shown in FIG.
A worm gear 41 including a worm shaft 41a and a worm wheel 41b is connected to the worm wheel 41b.
A one-way clutch 42 is arranged in the. As shown in FIGS. 2A and 2B, the one-way clutch 42 is composed of an outer ring 42a and an inner ring 42b, and the rotational force of the outer ring 42a in a certain direction is transmitted to the inner ring 42b. The rotational force in the opposite direction of 42a is configured not to be transmitted to the inner ring 42b. Further, the rotation of the inner ring 42b is configured not to be transmitted to the outer ring 42a.

In addition, the shaft 31 provided at the center of the worm wheel 41b
Are connected to the cam shaft 17 via the sprocket 14, the tune 15, and the sprocket 16.

* Operation of the Embodiment * The operation process of the circuit breaker electric spring operating mechanism according to the present embodiment having such a configuration will be described below.

Energizing Spring Accumulation The driving force of the electric motor 1 is transmitted from the worm gear 41 to the outer ring 42a of the one-way clutch 42, and further to the inner ring 42b. The driving force transmitted to the inner ring 42b is transmitted from the shaft 13 to the chain 15 and the sprocket 16 via the sprocket 14. Further, due to this rotational force, the eccentric cam 18 fixed to the cam shaft 17 pushes up one end of the lever 20 that rotates about the shaft 19 upward, compresses the closing spring 21, and stores energy.

Even if the electric motor stops halfway, the worm shaft 41a cannot be rotated by the worm wheel 41b, so that the worm shaft 41a will not be reversed by the spring force.

Closing the circuit breaker and accumulating the breaking spring When a closing command is issued to the breaker, the closing spring 21 pushes up the lever 20 to rotate about the shaft 19 and rotate the eccentric cam 18, which causes eccentricity. The closing cam 26 fixed to the cam 18 and the cam shaft 17 rotates, and further, the rotation causes the lever 27 to rotate about the shaft 28 and the coaxial output lever 29 to rotate, and is connected to the tip thereof. The drive shaft of the circuit breaker is moved, and the circuit breaker is closed.

On the other hand, sandwiching the shaft 28, on the side opposite to the closing cam 26,
The rod 30 connected to the lever 27 moves together with the closing operation of the circuit breaker, rotates the lever 31, and stores the breaking spring 32.

At this time, the rotation of the shaft 17 causes the sprocket 16,
Although the shaft 13 is rotated via the chain 15 and the sprocket 14, the shaft 13 is connected to the inner ring 42b of the one-way clutch 42, and the rotation of the inner ring 42b is configured not to be transmitted to the outer ring 42a. Is not damaged by the rapid rotation of shaft 17.

Further, in the present embodiment, the attachment / detachment of power between the electric motor 1 and the cam shaft 17 can be performed by utilizing the power attachment / detachment function of the one-way clutch arranged on the worm wheel 41. That is, the driving force of the electric motor 1 is transmitted from the outer ring 42a of the one-way clutch 42 to the inner ring 42b when the closing spring is stored, and the inner ring 42b of the one-way clutch rapidly rotates due to the spring force during the closing operation. However, due to the function of the one-way clutch 42, the outer ring 42a
Does not rotate. If the electric motor 1 is stopped halfway, the one-way clutch 42 tries to rotate due to the repulsive force of the closing spring 21, but the one-way clutch 42 cannot rotate because the outer ring 42a is connected to the worm worm 41b. This makes it possible to prevent reverse rotation when the motor is stopped.

As described above, in this embodiment, the reduction mechanism is
Since the worm gear and the one-way clutch are used, the number of parts constituting the circuit breaker electric spring operating mechanism can be significantly reduced, and the assembly process can be simplified and the cost can be reduced.

Further, as a result of the reduction in the number of parts, the occurrence of failures is significantly reduced, and the reliability of the electric spring operating mechanism for circuit breaker is significantly improved.

Furthermore, by connecting the worm wheel connected to the electric motor and the outer ring of the one-way clutch, the power of the electric motor and the cam shaft can be attached and detached by using the power attachment and detachment function of the one-way clutch, thus eliminating the need for clutch pawls. The number of parts that are easily damaged is reduced.

[Effects of the Invention] As described above, according to the present invention, a reduction mechanism using a worm gear is connected to an electric motor, an outer ring of a one-way clutch is arranged on a worm wheel of the worm gear, and a one-way clutch is provided on the outer ring. It is possible to reduce the number of parts of the reduction gear mechanism by a simple means of arranging the inner ring of the above and configuring the closing spring to be stored by the driving force of the electric motor transmitted to the inner ring, which is economical and reliable. It is possible to provide an electric spring operating mechanism for a circuit breaker with high efficiency.

[Brief description of drawings]

FIG. 1 is a bird's-eye view development view showing an embodiment of an electric spring operating mechanism for circuit breaker of the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, (A) is a side view, and (B) is a front view. FIG. 3 is a bird's-eye view development view showing the configuration of a conventional electric spring operating mechanism for circuit breaker, and FIG. 4 is an enlarged view of a main part of FIG. 1 ... motor, 2,3 ... V belt, 4,5 ... V pulley, 6
…… Sprocket, 7,8 …… Chain, 9,10,11 …… Sprocket, 12 …… Clutch claw, 13 …… Shaft, 14 …… Sprocket, 15 …… Chain, 16 …… Sprocket, 17 ……
Shaft, 18 …… Eccentric cam, 19 …… Shaft, 20 …… Lever, 21 ……
Closing spring, 22 …… Clutch cam, 23 …… Shaft, 24 …… Clutch lever, 25 …… Pin, 26 …… Closing cam, 27 …… Lever, 28 …… Shaft, 29 …… Output lever, 30 …… Rod, 31 ...
… Lever, 32 …… Isolation spring, 33 …… Drive shaft, 34 …… Clutch pawl return spring, 41 …… Worm gear, 41a …… Worm shaft, 41b …… Worm wheel, 42 …… One-way clutch, 42a …… Outer ring, 42b ... inner ring.

Claims (3)

[Claims] 1. A closing spring is stored by a driving force of an electric motor,
In addition to closing the circuit breaker by releasing the closing spring, an electric spring operating mechanism for a circuit breaker that stores the breaking spring, a reduction mechanism using a worm gear is connected to the electric motor,
An electric spring operating mechanism for a circuit breaker, wherein an outer ring of a one-way clutch is arranged on a worm wheel of the war gear, and an inner ring of a one-way clutch of the outer ring is further arranged. 2. The electric spring operating mechanism for a circuit breaker according to claim 1, wherein the one-way clutch is configured so that only one rotation of the outer ring can be transmitted to the inner ring. 3. The electric spring operating mechanism for a circuit breaker according to claim 1, wherein the one-way clutch is configured so that the rotation of the inner ring cannot be transmitted to the outer ring.